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What's the author's purpose of writing?

My question is: Is Choice A (an idiom) reasonable as the purpose of the following passage? I should think the purpose of this passage should be 'to tell the readers how to use bank cards'. Thank you in advance.

The purpose of the passage below is to show you how to ______.
A. play your cards right B. use your cards abroad
C. draw cash with your cards D. pay for goods with your cards

The given answer is A. (from my province's 2008 College Entrance Examination Paper)

We have designed all our bank cards to make your life easier. How to use your NatWest Servicecard
As a Switch card, it lets you pay for all sports of goods and services, whenever you see the Switch logo. The money comes straight out of your account, so you can spend as much as you like as long as you have enough money (or an agreed overdraft(透支) )to cover it. It is also a cheque guarantee(担保) card for up to the amount shown on the card. And it gives you free access to your money from over 31,000 cash machines across the UK. How to use your NatWest Cashcard
You can use your Cashcard as a Solo card to pay for goods and services wherever you see the Solo logo. It can also give you access to your account and your cash from over 31,000 cash machines nationwide. You can spend or withdraw(提取) what you have in your account, or as much as your agreed overdraft limit.
Using your card abroad
You can also use your Servicecard and Cashcard when youíre abroad. You can withdraw cash at cash machines and pay for goods and services wherever you see the Cirrus or Maestro logo displayed.
We take a commission charge of 2.25% of each cash withdrawal you make (up to ￡4) and a commission charge of 75 pence every time you use Maestro to pay for goods or services. We also apply a foreign-exchange transaction fee of 2.62%. How to use your NatWest Credit Card
With your credit card you can do the following:
Pay for goods and services and enjoy up to 56 daysí interest-free credit.
Pay in over 24 million shops worldwide that display the Mastercard or Visa logo.
Collect one AIR MILE for every ￡20 of spending that appears on your statement.
(This does not include foreign currency or travelerís cheques bought, interest and other charges.)

Re: What's the author's purpose of writing?

Originally Posted by joham

And freezeframe, are you saying the question in the exam paper is a horrible one or my question is a horrible one?

The exam question.

I think mixing idiom with the literal description of cards is confusing. Also, it's just a list of benefits of various cards, it doesn't tell you how to play your cards. In my opinion, this question is ridiculous.

Re: What's the author's purpose of writing?

I agree completely that it's a horrible question, mixing the literal use of bank cards with the idiom referring to playing cards. I'm sure whoever thought it up thought he or she was very clever, but I think it's unfair to ask of non-native speakers.

I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.